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A search for the $K^+ \to \mu^- \nu e^+ e^+$ decay / NA62 Collaboration
A search for the $K^+ \to \mu^- \nu e^+ e^+$ decay forbidden within the Standard Model by either lepton number or lepton flavour conservation depending on the flavour of the emitted neutrino, has been performed using the dataset collected by the NA62 experiment at CERN in 2016–2018. An upper limit of $8.1 \times 10^{-11}$ is obtained for the decay branching fraction at 90% CL, improving by a factor of 250 over the previous search..
arXiv:2211.04818; CERN-EP-2022-243.- Geneva : CERN, 2023-03-10 - 12 p. - Published in : Phys. Lett. B 838 (2023) 137679 Draft (restricted): PDF; Fulltext: 2211.04818 - PDF; Publication - PDF; CERN-EP-2022-243 - PDF;

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Search for heavy neutral lepton production in $K^+$ decays to positrons / NA62 Collaboration
A search for heavy neutral lepton ($N$) production in $K^+\to e^+N$ decays using the data sample collected by the NA62 experiment at CERN in 2017--2018 is reported. Upper limits of the extended neutrino mixing matrix element $|U_{e4}|^2$ are established at the level of $10^{-9}$ over most of the accessible heavy neutral lepton mass range 144--462 MeV/$c^2$, with the assumption that the lifetime exceeds 50 ns. [...]
arXiv:2005.09575; CERN-EP-2020-089.- Geneva : CERN, 2020-07-02 - 9 p. - Published in : Phys. Lett. B 807 (2020) 135599 Article from SCOAP3: PDF; Fulltext: 2005.09575 - PDF; CERN-EP-DRAFT-NA62-2020-001 - PDF;

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Search for lepton number and flavour violation in $K^+ $ and $\pi^0$ decays / NA62 Collaboration
Searches for the lepton number violating $K^+ \to \pi^− \mu^+ e^+$ decay and the lepton flavour violating $K^+ \to \pi^+ \mu^- e^+$ and $\pi^0 \to \mu^- e^+$ decays are reported using data collected by the NA62 experiment at CERN in 2017$-$2018. No evidence for these decays is found and upper limits of the branching ratios are obtained at 90% confidence level: B($K^+ \to \pi^− \mu^+ e^+$) $< 4.2 \times 10^{−11}$, B($K^+ \to \pi^+ \mu^- e^+$) $< 6.6 \times 10^{−11}$ and B($\pi^0 \to \mu^- e^+$) $< 3.2 \times 10^{−10}$. [...]
arXiv:2105.06759; CERN-EP-2021-090.- Geneva : CERN, 2021-09-24 - 8 p. - Published in : Phys. Rev. Lett. 127 (2021) 131802 Draft (restricted): PDF; Fulltext: 2105.06759 - PDF; CERN-EP-2021-090 - PDF; Publication - PDF; Fulltext from publisher: PDF;

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Searches for lepton number violating $K^+\to\pi^-(\pi^0)e^+e^+$ decays / NA62 Collaboration
Searches for lepton number violating $K^+\to\pi^-e^+e^+$ and $K^+\to\pi^-\pi^0e^+e^+$ decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 2016-2018. Upper limits of $5.3\times 10^{-11}$ and $8.5\times 10^{-10}$ are obtained on the decay branching fractions at 90% confidence level. [...]
arXiv:2202.00331; CERN-EP-2022-018.- 2022-07-10 - 16 p. Draft (restricted): PDF; Fulltext: 2202.00331 - PDF; CERN-EP-2022-018 - PDF;

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Search for $K^+$ decays into the $\pi^+e^+e^-e^+e^-$ final state / NA62 Collaboration
The first search for ultra-rare $K^+$ decays into the $\pi^+e^+e^-e^+e^-$ final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017-2018. An upper limit of $1.4\times 10^{-8}$ at 90% CL is obtained for the branching ratio of the $K^+\to\pi^+e^+e^-e^+e^-$ decay, predicted in the Standard Model to be $(7.2 \pm0 .7)\times 10^{-11}$. [...]
arXiv:2307.04579; CERN-EP-2023-133.- Geneva : CERN, 2023-09-22 - 9 p. - Published in : Phys. Lett. B 846 (2023) 138193 Draft (restricted): PDF; Fulltext: CERN-EP-2023-133 - PDF; Publication - PDF; 2307.04579 - PDF;

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First search for $K^+ \to \pi^0 \pi \mu e$ decays / NA62 Collaboration
The first search for the lepton number violating decay $K^+ \to \pi^0 \pi^- \mu^+ e^+$ and lepton flavour violating decays $K^+ \to \pi^0 \pi^+ \mu^- e^+$, $K^+ \to \pi^0 \pi^+ \mu^+ e^-$ has been performed using a dataset collected by the NA62 experiment at CERN in 2016–2018. Upper limits of $2.9\times 10^{-10}$, $3.1 \times 10^{-10}$ and $5.0 \times 10^{-10}$, respectively, are obtained at 90% CL for the branching ratios of the three decays on the assumption of uniform phase-space distributions..
arXiv:2409.12981; CERN-EP-2024-224.- Geneva : CERN, 2024-11-12 - 9 p. - Published in : Phys. Lett. B 859 (2024) 139122 Draft (restricted): PDF; Fulltext: CERN-EP-2024-224 - PDF; 2409.12981 - PDF; Publication - PDF;

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Measurement of the $K^+ \to \pi^+ \gamma \gamma$ decay / NA62 Collaboration
A sample of 3984 candidates of the $K^+ \to \pi^+ \gamma \gamma$ decay, with an estimated background of $291 \pm 14$ events, was collected by the NA62 experiment at CERN during 2017–2018. In order to describe the observed di-photon mass spectrum, the next-to-leading order contribution in chiral perturbation theory was found to be necessary. [...]
arXiv:2311.01837; CERN-EP-2023-247.- Geneva : CERN, 2024-02-07 - 11 p. - Published in : Phys. Lett. B 850 (2024) 138513 Draft (restricted): PDF; Fulltext: 2311.01837 - PDF; Publication - PDF; CERN-EP-2023-247 - PDF;

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An investigation of the very rare $K^+\rightarrow\pi^+\nu\bar{\nu}$ decay / NA62 Collaboration
The NA62 experiment reports an investigation of the $K^+\rightarrow\pi^+\nu\bar{\nu}$ mode from a sample of $K^+$ decays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of $(0.389\pm 0.024)\times10^{-10}$, corresponding to 2.2 events assuming the Standard Model branching ratio of $(8.4\pm1.0)\times10^{-11}$. [...]
arXiv:2007.08218; CERN-EP-2020-132.- Geneva : CERN, 2020-11-10 - 52 p. - Published in : JHEP 2011 (2020) 042 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: 2007.08218 - PDF; CERN-EP-2020-132 - PDF;

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Search for a feebly interacting particle $X$ in the decay $K^+ \to \pi^+ X$ / NA62 Collaboration
A search for the $K^+ \to \pi^+ X$ decay, where $X$ is a long-lived feebly interacting particle, is performed through an interpretation of the $K^+ \to \pi^+ \nu \bar\nu$ analysis of data collected in 2017 by the NA62 experiment at CERN. Two ranges of $X$ masses, $0-110$ MeV/$c^2$ and $154-260$ MeV/$c^2$, and lifetimes above 100 ps are considered. [...]
arXiv:2011.11329; CERN-EP-2020-227.- Geneva : CERN, 2021-03-04 - 14 p. - Published in : JHEP 2103 (2021) 058 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Draft (restricted): PDF; Fulltext: 2011.11329 - PDF; CERN-EP-2020-227 - PDF;

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Search for $\pi^0$ decays to invisible particles / NA62 Collaboration
The NA62 experiment at the CERN SPS reports a study of a sample of $4 \times 10^9$ tagged $\pi^0$ mesons from $K^+ \to \pi^+ \pi^0 (\gamma)$, searching for the decay of the $\pi^0$ to invisible particles. No signal is observed in excess of the expected background fluctuations. [...]
arXiv:2010.07644; CERN-EP-2020-193.- Geneva : CERN, 2021 - 27 p. - Published in : JHEP 02 (2021) 201 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2020-193 - PDF; 2010.07644 - PDF;

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